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Finding the Fourth Proportional to 1,328.06, 1,991.31 and 506.39

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Solution

The fourth proportional to 1,328.06, 1,991.31 and 506.39 is: 759.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,328.06 : 1,991.31 = 506.39 : x
  2. Step 2: Convert to fraction form
    1,328.06/1,991.31 = 506.39/x
  3. Step 3: Cross multiply
    1,328.06x = 1,991.31 × 506.39
  4. Step 4: Simplify right side
    1,328.06x = 1,008,369.51
  5. Step 5: Solve for x
    x = 1,008,369.51/1,328.06
  6. Step 6: Final answer
    x = 759.28

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.